DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.20132#0098
66
METHOD OF OBSEBVATION AND CALCULATION.
with each other; in many cases the latitude, longitude, and azimuth of the base line
were determined in immediate connection with our astronomical and magnetic obser-
vations.
n. METHOD OF OPERATION.
Our method of procedure was generally as follows. First a small line was
directly measured, and was then connected by triangulation with a larger line, which
then served as our final basis. Its length could be controlled again by measuring an
analogous line for verification near its other end.
In many instances we were able directly to define our base line by angles taken
to points fixed by the Great Trigonometric Survey; moreover, in general our vertical
angles, even for high peaks, were very large, while the distances, on the other hand,
were very small; a circumstance which, from the nature of the formulae, considerably
increases the accuracy of the result.
We may be allowed to mention the bearings and angular elevations taken in
connection with our numerous panoramas and drawings. For every object of some
extent, a tracing (in India generally executed by our assistants) has been made, in
which the angles obtained are written immediately near the objects measured, a process
admitting of considerable precision in defining the individuality of the mountains, &c.
The drawings proved of material assistance in recognising the principal objects, when
seen in another than the usual direction, since the general profile of dominant peaks
shows very little alteration at different angles, when the points of observation are not
too distant from each other.
Many of our angles could not be used for calculating heights or distances, as
some of the objects were visible from only one place, but even these isolated angles
have been used in completing the detail of our maps.
in. DESIGNATION OF THE OBJECTS MEASURED.
Occasionally, we experienced considerable difficulty in finding names for the
different objects, as they were measured. The custom of other geographers in similar
instances is to distinguish them by an arbitrary number, or initial, with latitude,
longitude, and height annexed. The difficulty in our case, however, was incidental
METHOD OF OBSEBVATION AND CALCULATION.
with each other; in many cases the latitude, longitude, and azimuth of the base line
were determined in immediate connection with our astronomical and magnetic obser-
vations.
n. METHOD OF OPERATION.
Our method of procedure was generally as follows. First a small line was
directly measured, and was then connected by triangulation with a larger line, which
then served as our final basis. Its length could be controlled again by measuring an
analogous line for verification near its other end.
In many instances we were able directly to define our base line by angles taken
to points fixed by the Great Trigonometric Survey; moreover, in general our vertical
angles, even for high peaks, were very large, while the distances, on the other hand,
were very small; a circumstance which, from the nature of the formulae, considerably
increases the accuracy of the result.
We may be allowed to mention the bearings and angular elevations taken in
connection with our numerous panoramas and drawings. For every object of some
extent, a tracing (in India generally executed by our assistants) has been made, in
which the angles obtained are written immediately near the objects measured, a process
admitting of considerable precision in defining the individuality of the mountains, &c.
The drawings proved of material assistance in recognising the principal objects, when
seen in another than the usual direction, since the general profile of dominant peaks
shows very little alteration at different angles, when the points of observation are not
too distant from each other.
Many of our angles could not be used for calculating heights or distances, as
some of the objects were visible from only one place, but even these isolated angles
have been used in completing the detail of our maps.
in. DESIGNATION OF THE OBJECTS MEASURED.
Occasionally, we experienced considerable difficulty in finding names for the
different objects, as they were measured. The custom of other geographers in similar
instances is to distinguish them by an arbitrary number, or initial, with latitude,
longitude, and height annexed. The difficulty in our case, however, was incidental